Convert Opus to MP3

Opus is what voice chat sounds like: WhatsApp voice notes, Discord clips, Telegram audio all use it, because at speech bitrates it beats everything else. Then the file leaves the app — for a transcript, an archive, a court exhibit, a car stereo — and almost nothing outside a browser will open it. Your browser will, which is all this page needs.

  1. Your voice notes

    Drop your Opus files here

    OPUSOGGMP3

    Your files are never uploaded.

  2. What you want back

  3. Your files

How to convert Opus to MP3

  1. Add your Opus files

    .opus and .ogg voice notes alike. Decoded by your browser and never uploaded.

  2. Leave it on MP3

    320 kbps. Or WAV, if the audio is going into an editor.

  3. Save the results

    Individually, or the batch as a zip.

What you get

Voice notes that play outside the app

The recording that only opened in WhatsApp becomes a file that plays in the car, attaches to an email, and uploads to systems that have never heard of Opus. That is the entire job, and it happens without the note leaving your machine.

Measured in every engine, not assumed

Opus decoding was verified here in Chromium, Firefox and WebKit — the current versions of all three read it natively. Nothing downloads, nothing installs.

A batch of a chat's worth

Export a conversation and drop every voice note at once. Each converts on its own row, keeps its name, and a failure on one does not stop the rest.

Private things stay private

Voice notes are among the most personal files a phone produces. They are decoded in this page — no upload step, no server, no copy anywhere else.

Questions about Opus

Will the MP3 sound as good as the Opus?
Almost — this is a lossy-to-lossy re-encode, kept gentle at 320 kbps, and for speech the difference is not audible. What is worth knowing: the MP3 will usually be much larger, because Opus at voice bitrates is extraordinarily efficient and MP3 simply is not. You are trading size for compatibility, deliberately.
My voice note is a .ogg file — is that Opus?
Often, yes. Opus commonly travels inside the Ogg container, so both .opus and .ogg extensions land here and both decode. The page reads the audio, not the extension, so either way the answer comes from trying the file.
Why does so little software open Opus?
It is younger than most of the gear that refuses it. Opus became the internet's voice codec — WebRTC, voice chat, streaming — years after car stereos and desktop players froze their format lists. Browsers kept up because the web is where Opus lives; this page borrows their decoder.
Can it convert a whole exported chat?
Yes — drop every file the export produced. Anything that is not audio fails on its own row with the reason and the rest continue. For turning the notes into text instead, the transcriber on this site takes Opus directly.
Is it free, and is my file uploaded?
Free, no account, no limit. Everything runs in your browser. Your files are never uploaded.

Need the words rather than the sound? The transcriber turns recordings into text, on this same no-upload model. Cleaning up a noisy recording first? Remove the background noise. Or see all the audio tools.